Question about 1994 Ford Aspire

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I have a 1994 ford Aspire Fuel injected that is having timing and idle surges when at idle. I can’t set timing or idle because of the surging, even when jumper ST1 to ground on the diagnostic port. Only codes being thrown are 12 & 17, Ox sensor and TPS sensor. Both seem to be fine. Could this be being cause by the Crank position sensor in the distributor?

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  • Anonymous Mar 31, 2014

    can you have a faulty tps that causes idle and drive problems such as bucking, jerking, and shutdown while idleing cold but the check engine light is not on and no codes come up on computer.


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I've been trying to get the timing procedures for this model, as I have a 94 aspire. sounds like you have something (a timing light) hooked up and can see the the timing mark moving, but I assume when you say you've shorted st1 to ground, that eliminates the computer control of idle. So the the computer is out of the equation, right? Or is it not electronic ignition?
I have eliminated some idle roughness by cleaning and setting spark plug gap, new air filter, and if its time, a new gas filter. Then, cleaned the sensors inside the air filter compartment, and the intake manifold. I'd heard of using wd40 on the same part of a taurus referred to as a oxygen sensor. But eventually, cleaning the plate that opens to let oxygen into the intake manifold is a good idea. I have 160,000 miles on my aspire ( 4 door hatchback 5-speed manual) and it gets 49 mpg on trips. I replaced the gear oil with mercon dextron last winter, It may have helped increase a few mpg. Also, check for vaccum leaks in your vaccum hoses. that's all I can think of right now.

Posted on Sep 30, 2008

  • david andrewv conrad Sep 30, 2008

    I just did the timing on my Aspire today and I noticed that the mark moves some, It was at tdc, so I set it as close to the 10 degree btdc, I noticed the idle came down some as well. It makes me wonder why the mark would move. Does a worn timing belt (95,000 miles) make this happen? Or could the fluctuation originate from a part producing the spark in the distributer area?


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